<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="js/jquery-1.9.0.js"></script>
<script type="text/javascript">
	function f() {
		alert($(window.parent.document).find("#a").html());
		//alert($('#a', window.parent.document).html());
		//alert(window.parent.document.getElementById("a").innerHTML);
	}
	
	function c() {
		alert('c');
	}
</script>
</head>
<body>
<div id='inner'>this is index.html</div>
<input type='button' onclick="f()" value="click"/>
</body>
</html>